Easy. A loud fire alarm. It's not just about volume - it's the tone, too. I'd take a -9846, 10-inch bell, or an old IBM horn over nails on a chalkboard any day. After all, we're "The Fire Panel" not "The Nails on the Chalk Board".

Would probably depend on the alarms, my proximity to them, and the acoustics of the area. I'd go with the nails on the chalkboard over revisiting my early elementary school nightmare of Federal 30A's in the gym. But an electronic or DC mechanical horn would probably be preferable over the fingernails, unless maybe I was standing right in front of the alarm.

LOL at "The Nails on the Chalk Board". I'd be shocked if there actually was such a thing, but then again our interest is unusual enough as it is.

It depends if I didn't know which one of them were coming. Its always the anticipation that kills me and I couldn't deal with that and waiting for it when you know its going to happen just kills me. Probably nails on a chalkboard for both. Mostly because I never heard nails on a chalkboard before. LOL

TO be honest, I'd choose an alarm going off suddenly rather than fingers scratching a chalkboard.

(Sorry about eventuals typos, am writing this from my phone)

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